"I would never buy a player last week of the season" also because it is practically impossible.
Apart buying a low-quality player (since he's going to lose one star few days later), don't forget the difficulty to get him: the majority of managers don't even reply to your offer, and by the other hand it's not wise to make multiple offers for different players in the same role.
Before, I noticed that buying 3-4 players required many days or even weeks of "offer and wait 24 hours" to complete, and now I have only one week to buy a 20% less quality player....
And not to forget also that you have to spend a certain amount of tokens anyway.... when I offer 2-4 token to the manager, Nordeus gets 8-14 token as well. Whit some luck (and a lot of time to spend) you can even get better trade on auctions...
For this reasons I repeat: negotiations are totally gone and their tab could be peacefully scrapped away. Playability has lost a lot with this.